Locomotive boiler



i June24,1930. O.H.HARTMANNETAL y L768J98 LOCOMOTIVE BOILER Filed Feb. 9, 1928 leg/#g1 pri Patented .lune 24, 19330 UNETED resales narrar erstes OTTO H. HARTMANN, OF KASSEL-WILHELMSHOHE, AND WILHELM JUNG, OF KASSEL, GER-MANY, ASSIGNGRS TO SCHIVIIDTSCHE HEISSDAMPF-GESELLSCHAFT, lVI. B. I-I., OF KASSEL-WILHELIYSHOHE, GERTvANY, A CORPORATEON GF GERMANY LOCOIIIOTIVE BOILER Application led. February 9, 1923, Serial No. 253,140, and in Germany February 14, 1927.

The present invention relates to locomotive boilers, and is an improvement on the boiler shown 1n U. S. Patent No. 1,648,396 issued November 3, 1927, to Utto H. Hartmann. In said patent, a locomotive boiler 1s shown which comprises a longitudinal low-pressure boiler, and av high-pressure boiler supplied with heat trom a water-tube lire box. Between the lire box and the longitudinal boiler is provided a Icombustion channel delined by water-tubes which communicate with the high-pressure section, that is to say, with the water-tube hre-box.

In order to increase the generation of highpressure steam and to make it possible to vary the production of high-pressure steam so as to obtain any desired ratio'between it and the low-pressure steam, and thus to make the most favourable use of all the advantages from the use of high-pressure steam, the present invention provides, in addition to the water-tubes surrounding and defining the combustion channel, additional water-tubes I located in the combustion `channel and communicating with the high pressure watertube fire-box. These additional water-tubes are provided in any desired number, and are preferably arranged in groups extending transversely of the combustion channel, and provided at their upper and lower ends with collecting chambers, which may communicate with the high-pressure drum or, in case of indirect high-pressure steam generation, with a heat-exchange element disposed in said drum.

The accompanying drawing illustrates one form of the invention as applied to, a twostage locomotive boiler.

Fig. 1 is a fragmentary longitudinal section through the water-tube tire box and a part ot the longitudinal boiler;

Fig. 2 is a section taken on the line 2 2 of Fig. 1; and f Fig. 3 is a section on the line 3-3 of Fig. 1.

The drawing shows the invention applied to a boiler wherein the high-pressure steam is generated indirectly, but it will be understood that the invention is equally applicable to a boiler arranged for the direct generation of high-pressure steam.

The drawing shows a locomotive boiler arranged to generate low-pressure steam in a longitudinal fire-tube boiler 5, 'and high-pressure steam in a high-pressure drum 3. The

numerall represents the longitudinal water chambers surrounding the grate, and 2 indicates transverse chambers 'connected with chambers 1. llVater-tubes l extend upwardly from chambers 1 to form a lire box, the tubes crossing each other below the highpressure drum 3, of which there may be one or more.

The upper ends of tubes 4L are connected to a pair ot headers 10, every alternate tube being bent transversely to vconnect with the header 10 on the opposite side of the boiler, while theremaining tubes extend substantially vertically to the header on the same side of the boiler as the base of the tubes. The tubes at each side of the fire box are arranged in two rows in such a manner that the tubes il of the inner row serve as risers for the water heatedby the combustion gases, and the tubes 11 of the outer row serve to conduct the cooler water downwardly. Water-tubes 7 are disposed between the fire box and the longitudinal boiler 5, and deine a combustion channel, the floor ot the channel being formed by water-tubes 8, 8a. Tubes 7 are connected at their lower ends to chambers 9 andy at their upper ends to the headers 10 of the circulating system, alternate tubes being conne-cted to opposite headers as in the case of the tire-box tubes. Tubes 7 are also arranged in A two rows on each side of the combustion chaners 11a extend from the transverse chamberv l11 to the headers 10, the return movement of the heating medium taking place through the tubes en to the longitudinal chambers 1 and to the front transverse chamber 2 connected thereto.

In addition to the water-tubes surrounding the combustion channel, additional vgroups of water-tubes are provided (in the present case five groups) consisting of parallel water-tubes 17 extending transversely of the combustion channel. The tubes 17 of each group lie in a common plane extending transversely to the axis ot the channel, and are secured at their upper and lower ends to the transverse chambers 19 and 18 respe'c* tively, the upper chambers 19 being directly connected to t-he headers 10, and the lower chambers to descendingtubes 20, as shown at the left of Fig. 2.

The steam generated by the heating, medium in all the water-tubes of the tire box and of the combustion channel is collected in headers 10, which give up their heat to the drum 3 by means of heat-exchange elements such as the heating coils 15 lying in the drum. The condensate formed in coils 15 returns through tubes 16 to the lower water chanrbers, from which a new cycle of circulation begins.

As will be evident from the drawings, the additional water-tubes 17 greatly increase the heating surface kprovided in the combustion channel, and consequently increase the generation of high-pressure steam, so that the output of the locomotive due to the highpressure steam is increased and the coal consumption accordingly decreased.

y Vhile we have shown tive groups of watertubes 17, this number may of course be made smaller `or greater as found desirable, depending on the desired ratio between highpressure steam and low-pressure steam.

In the combustion channel, tubes 17 are so arranged as to leave a central passage 21 through. which therear tube sheet ofthe longitudinal boiler can be inspected and repaired. The space 21 is normally closed by av member 22 of ireproof material which prevents the passage of the combustion gases through the passage 21 and which deflects them laterally through the tubes 17. Member 22 is mounted so as to be easily removable to allow access to the tube sheet of the longitudinal boiler 5 when desired.

Tubes 17 ma be formed in various wa s for instance in the form of coils, and they tire box, a tire-tube boiler in which low pressure steam is generated by combustion gases from said lire box, water tubes connected to the aforesaid headers forming a constricted combustion channel located between said fire box and said lire-tube boiler, and a plurality of additional tubes traversing said combustion channel, said additional tubes communicating with transverse chambers which are connected to the aforesaid headers whereby a complete circulation through the additional tubes in the combustion channel and the coils in the aforementioned drum is effected.

2. A locomotive comprising a water-tube lire box, a drum connected to the upper ends of the tubes of said lire box to torni therewith a high-pressure steam boiler, a fire-tube boiler in which low pressure steam is generated by the combustion gases from said lire box, water-tubes forming a constricted combustion channel located between said fire box and said tire-tube boiler, the tubes of said combustion channel being connected to said drum to transfer heat from the combustion channel to said drum, a plurality of additional tubes transversing said combustion channel and communicating with the high-pressure wa tertube fire-box to increase the ratio of high pressure steam generated to that generated in the low Apressure boiler, said additional tubes c set our hands. v

OTTO H. HARTMANN. l/VILHELM JUNG.

may also be directly connected to headersV lOit desired.

Various modifications may be made without departing from the nature of the invention as set forth in the appended claims.

We claim:

1. A locomotive boiler comprising a watertube fire box, upper and lower longitudinal headers to which the tubes in said lire box are connected, a high pressure steamI drum, coils in said drum communicating. with the headers and with the tubes comprising the 

